.btn-file {
	position: relative;
	overflow: hidden;
}

.btn-file input[type=file] {
	position: absolute;
	top: 0;
	right: 0;
	min-width: 100%;
	min-height: 100%;
	font-size: 100px;
	text-align: right;
	filter: alpha(opacity = 0);
	opacity: 0;
	background: red;
	cursor: inherit;
	display: block;
}

input[readonly] {
	background-color: white !important;
	cursor: text !important;
}